From 8653d7fa608b57e2c4f3d87edc337893302bfde7 Mon Sep 17 00:00:00 2001
From: Vadim Zeitlin <vadim@wxwidgets.org>
Date: Sun, 3 Jun 2007 22:14:32 +0000
Subject: [PATCH] added colour normalization to PNM handler [backport from
 HEAD]

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_2_8_BRANCH@46311 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
---
 docs/changes.txt       |  4 ++++
 src/common/imagpnm.cpp | 18 ++++++++++++++++--
 2 files changed, 20 insertions(+), 2 deletions(-)

diff --git a/docs/changes.txt b/docs/changes.txt
index 09b0140a6b..dfdd0de66b 100644
--- a/docs/changes.txt
+++ b/docs/changes.txt
@@ -91,6 +91,10 @@ Major new features in 2.8 release
 2.8.5
 -----
 
+All (GUI):
+
+- Added colour normalization to PNM image handler (Ray Johnston)
+
 wxMSW:
 
 - Fix crash when destroying a default button (Tim Kosse)
diff --git a/src/common/imagpnm.cpp b/src/common/imagpnm.cpp
index 4c1a6205c9..85fbdc08a9 100644
--- a/src/common/imagpnm.cpp
+++ b/src/common/imagpnm.cpp
@@ -96,6 +96,8 @@ bool wxPNMHandler::LoadFile( wxImage *image, wxInputStream& stream, bool verbose
         for (wxUint32 i=0; i<size; ++i)
         {
             value=text_stream.Read32();
+            if ( maxval != 255 )
+                value = (255 * value)/maxval;
             *ptr++=(unsigned char)value; // R
             *ptr++=(unsigned char)value; // G
             *ptr++=(unsigned char)value; // B
@@ -114,6 +116,8 @@ bool wxPNMHandler::LoadFile( wxImage *image, wxInputStream& stream, bool verbose
             //this is very slow !!!
             //I wonder how we can make any better ?
             value=text_stream.Read32();
+            if ( maxval != 255 )
+                value = (255 * value)/maxval;
             *ptr++=(unsigned char)value;
 
             if ( !buf_stream )
@@ -130,6 +134,8 @@ bool wxPNMHandler::LoadFile( wxImage *image, wxInputStream& stream, bool verbose
         for (wxUint32 i=0; i<size; ++i)
         {
             buf_stream.Read(&value,1);
+            if ( maxval != 255 )
+                value = (255 * value)/maxval;
             *ptr++=value; // R
             *ptr++=value; // G
             *ptr++=value; // B
@@ -140,8 +146,16 @@ bool wxPNMHandler::LoadFile( wxImage *image, wxInputStream& stream, bool verbose
             }
         }
     }
-    if (c=='6') // Raw RGB
-      buf_stream.Read( ptr, 3*width*height );
+
+    if ( c=='6' ) // Raw RGB
+    {
+        buf_stream.Read(ptr, 3*width*height);
+        if ( maxval != 255 )
+        {
+            for ( unsigned i = 0; i < 3*width*height; i++ )
+                ptr[i] = (255 * ptr[i])/maxval;
+        }
+    }
 
     image->SetMask( false );